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タイトル: | Transient ionization of the mesosphere during auroral breakup: Arase satellite and ground-based conjugate observations at Syowa Station |
著者: | Kataoka, Ryuho Nishiyama, Takanori Tanaka, Yoshimasa Kadokura, Akira Uchida, Herbert Akihito Ebihara, Yusuke https://orcid.org/0000-0002-2293-1557 (unconfirmed) Ejiri, Mitsumu K. Tomikawa, Yoshihiro Tsutsumi, Masaki Sato, Kaoru Miyoshi, Yoshizumi Shiokawa, Kazuo Kurita, Satoshi https://orcid.org/0000-0002-1553-9557 (unconfirmed) Kasahara, Yoshiya Ozaki, Mitsunori Hosokawa, Keisuke Matsuda, Shoya Shinohara, Iku Takashima, Takeshi Sato, Tatsuhiko Mitani, Takefumi Hori, Tomoaki Higashio, Nana |
著者名の別形: | 片岡, 龍峰 西山, 尚典 田中, 良昌 門倉, 昭 内田, ヘルベルト 陽仁 海老原, 祐輔 江尻, 省 冨川, 喜弘 堤, 雅基 佐藤, 薫 三好, 由好 塩川, 和夫 栗田, 怜 笠原, 禎也 尾崎, 光紀 細川, 敬祐 松田, 昇也 篠原, 育 高島, 健 佐藤, 達彦 三谷, 烈史 堀, 智昭 東尾, 奈々 |
キーワード: | Aurora Mesosphere X-rays Energetic electrons |
発行日: | 23-Jan-2019 |
出版者: | Springer Nature |
誌名: | Earth, Planets and Space |
巻: | 71 |
論文番号: | 9 |
抄録: | Transient mesospheric echo in the VHF range was detected at an altitude of 65–70 km during the auroral breakup that occurred from 2220 to 2226 UT on June 30, 2017. During this event, the footprint of the Arase satellite was located within the field of view of the all-sky imagers at Syowa Station in the Antarctic. Auroral observations at Syowa Station revealed the dominant precipitation of relatively soft electrons during the auroral breakup. A corresponding spike in cosmic noise absorption was also observed at Syowa Station, while the Arase satellite observed a flux enhancement of > 100 keV electrons and a broadband noise without detecting chorus waves or electromagnetic ion cyclotron waves. A general-purpose Monte Carlo particle transport simulation code was used to quantitatively evaluate the ionization in the middle atmosphere. Results of this study indicate that the precipitation of energetic electrons of > 100 keV, rather than X-rays from the auroral electrons, played a dominant role in the transient and deep (65–70 km) mesospheric ionization during the observed auroral breakup. |
記述: | オーロラが爆発するとヴァン・アレン帯の電子が上空65 kmにまで侵入することを解明. 京都大学プレスリリース. 2019-02-12. |
著作権等: | © The Author(s) 2019. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. |
URI: | http://hdl.handle.net/2433/236396 |
DOI(出版社版): | 10.1186/s40623-019-0989-7 |
関連リンク: | https://www.kyoto-u.ac.jp/ja/research-news/2019-02-12-1 |
出現コレクション: | 学術雑誌掲載論文等 |
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